@article{NUMA_1991__60_4_133605,
     author = {T. Kerkhoven and Y. Saad},
     title = {On acceleration methods for coupled nonlinear elliptic systems.},
     journal = {Numerische Mathematik},
     pages = {525--548},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     zbl = {0724.65095},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133605/}
}